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    <article id="post-logical-delete" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2015-07-25T04:08:47.000Z" itemprop="datePublished">2015-07-25</time>
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      <a class="article-title" href="/2015/07/25/logical-delete/">逻辑删除</a>
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<li>物理删除，又称硬删除、真删除，即删除操作是将数据记录直接从数据库删除。</li>
<li>逻辑删除，又称软删除、假删除，通过添加删除标记或者将要删除的数据记录移动到另一张表的方式实现。好处就是对于误操作，数据被删除了，可以很方便地将数据恢复。</li>
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Updated:<time datetime="2015-08-10T02:38:33.000Z" itemprop="dateModified">2015-08-10</time>
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    <article id="post-mongodb-note-10-sharding" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/06/06/mongodb-note-10-sharding/" class="article-date">
  <time datetime="2014-06-06T08:45:46.000Z" itemprop="datePublished">2014-06-06</time>
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    <a class="article-category-link" href="/categories/Database/">Database</a>►<a class="article-category-link" href="/categories/Database/MongoDB/">MongoDB</a>
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      <a class="article-title" href="/2014/06/06/mongodb-note-10-sharding/">mongodb笔记(十) 分片</a>
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        <h2 id="分片简介">分片简介</h2><p>分片是指将数据拆分，将其分散存在不同的机器上的过程。</p>
        
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Updated:<time datetime="2014-12-24T07:50:09.000Z" itemprop="dateModified">2014-12-24</time>
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    <article id="post-mongodb-note-9-replication" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/06/05/mongodb-note-9-replication/" class="article-date">
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      <a class="article-title" href="/2014/06/05/mongodb-note-9-replication/">mongodb笔记(九) 复制</a>
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        <h2 id="主从复制">主从复制</h2><p>运行mongod —master就启动了主服务器。运行mongod —slave —source master_address则启动了从服务器，其中master_address就是上面的主节点地址。</p>
        
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    <article id="post-mongodb-note-8-administration" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/06/05/mongodb-note-8-administration/" class="article-date">
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      <a class="article-title" href="/2014/06/05/mongodb-note-8-administration/">mongodb笔记(八) 管理</a>
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        <p>启动和停止MongoDB在第一部分已经有记录了。</p>
<h2 id="监控">监控</h2><h3 id="使用管理接口">使用管理接口</h3><p>默认情况下，启动mongod时还会启动一个HTTP服务器。打开<a href="http://localhost:28017">http://localhost:28017</a> 可以看见管理接口。可以看到断言、锁、索引和复制等相关信息。</p>
        
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监控..." class="article-share-link">Share</a>
      

      
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    <article id="post-mongodb-note-7-advanced-topics" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/06/04/mongodb-note-7-advanced-topics/" class="article-date">
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      <a class="article-title" href="/2014/06/04/mongodb-note-7-advanced-topics/">mongodb笔记(七) 进阶指南</a>
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        <h2 id="数据库命令">数据库命令</h2><h3 id="命令工作原理">命令工作原理</h3><figure class="highlight stata"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">db</span>.<span class="keyword">test</span>.<span class="keyword">drop</span>()</span><br></pre></td></tr></table></figure>
<p>实际运行的是drop命令:<br><figure class="highlight stylus"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">db.<span class="function"><span class="title">runCommand</span><span class="params">(&#123;<span class="string">"drop"</span>:<span class="string">"test"</span>&#125;)</span></span></span><br></pre></td></tr></table></figure></p>
        
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    <article id="post-mongodb-note-6-aggregation" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/05/28/mongodb-note-6-aggregation/" class="article-date">
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      <a class="article-title" href="/2014/05/28/mongodb-note-6-aggregation/">mongodb笔记(六) 聚合</a>
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        <h2 id="count">count</h2><p>返回集合中的文档数量<br><figure class="highlight stata"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">db</span>.foo.<span class="keyword">count</span>()</span><br><span class="line"><span class="keyword">db</span>.foo.<span class="keyword">count</span>(&#123;<span class="string">"x"</span>:1&#125;) <span class="comment">//也可以传递查询，但会使count变慢</span></span><br></pre></td></tr></table></figure></p>
        
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    <article id="post-mongodb-note-5-indexing" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/05/26/mongodb-note-5-indexing/" class="article-date">
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      <a class="article-title" href="/2014/05/26/mongodb-note-5-indexing/">mongodb笔记(五) 索引</a>
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        <h2 id="索引简介">索引简介</h2><p>创建单键索引<br><figure class="highlight stylus"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">db.<span class="function"><span class="title">ensureIndex</span><span class="params">(&#123;<span class="string">"date"</span>:<span class="number">1</span>&#125;)</span></span></span><br></pre></td></tr></table></figure></p>
<p>创建复合索引<br><figure class="highlight stylus"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">db.<span class="function"><span class="title">ensureIndex</span><span class="params">(&#123;<span class="string">"date"</span>:<span class="number">1</span>,<span class="string">"username"</span>:<span class="number">1</span>&#125;)</span></span></span><br></pre></td></tr></table></figure></p>
<p>ensureIndex的文档形式和sort类似。</p>
        
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    <article id="post-mongodb-note-4-querying" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2014/05/08/mongodb-note-4-querying/" class="article-date">
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      <a class="article-title" href="/2014/05/08/mongodb-note-4-querying/">mongodb笔记(四) 查询</a>
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        <h2 id="find">find</h2><h3 id="指定返回的键">指定返回的键</h3><p>可以在find中通过多个键值对进行查询会被解释成and，多个键值对之间是且的关系</p>
<p>通过find的第二个参数可以指定返回的键<br><figure class="highlight gradle"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">db.users.<span class="keyword">find</span>(&#123;&#125;,&#123;<span class="string">"username"</span>:<span class="number">1</span>,<span class="string">"email"</span>:<span class="number">1</span>&#125;)</span><br><span class="line">db.users.<span class="keyword">find</span>(&#123;&#125;,&#123;<span class="string">"username"</span>:<span class="number">1</span>,<span class="string">"email"</span>:<span class="number">1</span>,<span class="string">"_id"</span>:<span class="number">0</span>&#125;)</span><br></pre></td></tr></table></figure></p>
<p>第一条语句将返回_id,username,email,_id总是被返回。如果不想返回_id指定为0</p>
        
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      <a class="article-title" href="/2014/05/04/mongodb-note-3-creating-updating-and-deleting-documents/">mongodb笔记(三) 创建、更新、删除文档</a>
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        <h2 id="插入并保存文档">插入并保存文档</h2><h3 id="批量插入">批量插入</h3><p>可以使用<code>batchInsert()</code>进行批量插入，如果是导入原始数据可以使用<code>mongoimport</code>。批量插入只能插入一个集合，不能插入一次对多个集合操作。</p>
<p>当前版本mongodb接收的最大消息长度为16MB，所以使用批量插入会有所限制。不过一些驱动会将消息拆分为48MB。</p>
        
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        <h2 id="文档">文档</h2><p>多个键/值对有序放置在一起便是文档。文档类似于关系数据库中的行，但比行要复杂很多。</p>
        
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        // 对所有文章遍历,然后将有文章的日期加上链接,如果文章太多的话,生成页面会很大,去掉了
        
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                _that.month = 11;
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            // 填充日历
            _that.fillDate(_that.year,_that.month);
        };
    },
    init:function(){
        this.oTit.innerHTML = '<span>日</span><span>一</span><span>二</span><span>三</span><span>四</span><span>五</span><span>六</span>';
        // 获取今天的日历时间
        var now = new Date();
        this.c_year = this.year = now.getFullYear();
        this.c_month = this.month = now.getMonth();
        this.date = now.getDate();
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        //next切换
        this.next();
        //prev切换
        this.prev();
        //back 切换
        this.back();
        //now 切换
        this.now();
    }
}
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